Abstract
The evaluation of fatigue damage represents a fundamental challenge for the deep comprehension of the fatigue phenomena. In this work, a real-time monitoring of fatigue damage by Electrical Resistance method is carried out on a batch of AISI 316L stainless steel specimens with U-shaped notch at different stress levels. The temperature of the specimens was also on-line monitored during the test using three thermocouples type T to eliminate heating due to cycling load and Joule effect. The experimental results show that resistance decreases in the initial stages of fatigue and subsequently, starting from about 20-40% of the fatigue life, shows a rapid increase associated to the fatigue damage close to the notch tip. Before final failure, from about 80-90% of the fatigue life, the resistance increases rapidly in the propagation phases of the crack. This latter behaviour is coherent with the reduction in stiffness obtained by processing fatigue data of the tested specimens. In conclusion, the applied experimental method proved to be effectively valid for predicting with accuracy the evolution of fatigue damage of metals.
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